A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is 6∘10′. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m)642.105

A theodolite is set up at station A and 3 m long staff is is held vert

1.	A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is 6∘10′. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m)642.105
Answer» A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is $6^{\circ} 10^{'}$ . The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m) 642.105